High frequency transformer or the like



July 21, 1931. F GERTH HIGH FREQUENCY TRANSFORMER OR THE IrIKE Filed May 4. 1929 Patented July 21, 1931 UNITED STATE'S' PATENT QFFICE,

: FELIX GERTH, OF BERLIN-TEMPELHOF, GERMANY, ASSIGNOR T0 C. LORENZ AKTIEN- GESELLSGHAFT, OF BERLIN-TEMPELHOF, GERMANY HIGH FREQUENCY TRANSFORMER OR THE LIKE Application fi-led May 4, 19-29, Serial No. 360,579, and in Germany May 5, 1928'.

This invention relates to iron core transformers and frequency converters operating upon high frequency currents, and similar apparatus in which the iron parts are sur rounded on all sides by a cooling medium under forced circulation, sothat both an electric and a heat insulation between the iron and the winding is obtained. The degree of reduction of heat thuseffected between the iron and the winding is often of high importance in devices of this class. For instance, in frequency changers a comparatively low maximum temperature is desirable to system, there exist certain difficulties aris-- ing from the fact that in order to dissipate large quantities of heat in such appliances, a very high pressure must be given to circulate the cooling medium, and in spite of this it very often happens that the cooling of the iron is not uniform and in consequence the degree of efficiency is diminished.

In the drawing one mode of practising the present invention is illustrated by way of example.

Figure 1 is a view of a high frequency converter provided with an improved cooling means embodying my invention,

Figure 2 is a vertical section, and

Figure 3 is a horizontal section of the same.

By the present invention means are provided which will obviate or reduce the objections above mentioned, and at the same time limit the necessary pressure of the cooling medium. To this end the cooling medium coming from a common source of supply is admitted to and discharged from a plurality of cooling chambers surrounding the iron core, the inlet opening of one chamher and the outlet of adjacent chamber being arranged close toone another so thatmaximum. cooling efliciency is obtained.

This is more specifically disclosed in the drawing in which E represents an annular core of high frequency iron in the form of thin wires or sheets, as such are employed for instance in frequency changers. The said; core is associated with a winding W of high frequency strands which are wound around an annular casing embodying, inner and outer rolls O and C of. insulating material surrounding the core, said casing be ing subdivided into individual chambers K (four in the example illustrated), through. which the cooling medium flows. The ad,- mission of the cooling medium. such as; oil iseffected through a central pipe R, from which latter radially extend several conduits L leading. to the inlet opening'sa of the said? chambers K. The oil entering at awill' flow around the iron core, which in the present instance consists of aplurality of discs: with: distance pieces between said discs, which pieces are designated by D, and the oil isdischarged at the outlets b. The division of the several chambers is obtained by means of partitions Z. Mechanical stability is obta-ined by the provision of two punched plates P and P and layers: of felt F ,1? held connected by means of tension screws B- and: forming closures. for the" top: and. bottom; of the annular casing, G Cg.

The inner and outer annular Walls C and G are of course bridged at the-=topand bottom so that the space between these walls is completely enclosed, asiwill be: understood.

In operation, the cooling medium is supplied through the pipe R and the) inlets a and outlets b of the cooling chambers are. so ar-- ranged that the inlet a of each chamber adjoins the outlet 6 of an adjacent chamber, so that the cool oil flowing into each chamber tends to cool the heated portion of the adjacent chamber. It is obvious, that by this" means the cooling action isto a large degreeequalized, which is not the case-- where the" cooling medium is-causedto'flow continuously' about the entire surface of the core.- In

sis

fact, it is possible to obtain in this Way in a fully satisfactory manner the proper distribution of heat over the iron and the winding in accordance with the admissible and desired temperatures respectively. This invention may also be applied to any other high frequency apparatus, for instance telephone chokes and the like, in any suitable form.

I claim:

1. A high frequency transformer or the like comprising an annular core, a winding for coaction with the core, an annular casing of insulating material surrounding the core and about which the winding is wound, said casing being formed to provide an annular series of chambers for circulation of a cooling medium, each chamber having an inlet at one end and an outlet at its opposite end and the inlet end of each chamber lying adjacent the outlet of an adjacent chamber.

2. A high frequency transformer or the like comprising an annular core, a winding for coacting with the core, an annular casing of insulating material enclosing and surrounding the core and about which the winding is wound, said casing having partitions sub-dividing it into an annular series of cooling chambers, each having an inlet opening through its inner periphery and an outlet opening through its outer periphery, and means connected with the inlet for supplying a cooling medium for circulation through said chambers.

3. A high frequency transformer or the like comprising an annular core, a winding for coaction with the core, an annular casing of insulating material enclosing and surrounding the core and about which the winding is Wound, said casing having partitions sub-dividing it into an annular series of cooling chambers, each having an inlet openin g through the inner periphery of the casing and an outlet at its opposite end opening through the outer periphery of the casing, the inlet end of each chamber being arranged adjacent to the outlet end of an adjoining chamber, and means connected with the inlets of the chambers for supplying a cooling medium for circulation through said chambers.

4. A high frequency transformer or the like comprising an annular core, a winding for coaction with the core, an annular casing of insulating material enclosing and siirrrounding the core and about which the winding is wound, said casing being provided with partitions sub-dividing it into an annular series of chambers for circulation of a cooling medium, each chamber having an inlet at oneend opening through the inner periphery of the casing and an outlet at its opposite end opening through the outer periphery of the casing, an inlet conductor, and radially arranged conductors extending from said inlet conductor to and communicating with the inlets of the cooling chambers.

5. A high frequency transformer or the like comprising an annular core, a winding for coaction with the core, an annular casing of insulating material surrounding the core and .about which the winding is Wound, said casing being partitioned to provide an annularseries of chambers for circulation of a cooling medium, each chamber having an inlet at one end opening through the inner periphery of the casing and an outlet at its opposite end opening through the outer periphery of the casing, the inlet of each chamber being arranged adjacent to the outlet of an adjoining chamber, a centrally arranged conductor, and radially arranged conductors connecting said centrally arranged conductor with the inlets of the chambers.

6. A high frequency electrical apparatus comprising a core, a winding for coaction with the core, a casing of insulating material surrounding said core and enveloped by said winding, said casing containing a series of chambers, each chamber having an inlet and an outlet, the inlet of one chamber lying adjacent the outlet of an adjacent chamber and means for supplying a cooling medium to be admitted to said chambers through said inlets.

7. A high frequency electrical apparatus comprising a core, a winding for coaction with the core, a casing of insulating material surrounding a core and enveloped with the winding, said casing being formed to provide a series of chambers arranged end to end, each chamber having an inlet and an outlet with the inlet of one chamber adjacent to the outlet of another and means for supplying a cooling medium through said inlets to said chambers.

In testimony whereof I have afiixed my signature.

FELIX GERTH. 

